The utility model discloses a fully automatic angle grinder which comprises a machine frame provided with a feeding device, a micro adjustment device and an angle grinding device, wherein the feeding device comprises a rolling rod arranged on the surface of the machine frame and a roller driven by a motor, the micro adjustment device comprises a spacing wheel and a movable cap connected with the spacing wheel and sheathed on a worm shaft which is directly connected with a handle wheel or a motor or through another worm shaft, and the angle grinding device comprises a bracket, a movable frame, a motor, a grinding wheel and a swinging mechanism which drives the movable frame to swing. One end of a rotary shaft of the motor is provided with the grinding wheel, and the other end is connected with the swinging mechanism. The motor is fixed on the movable frame movably connected with the bracket. The utility model can relieve workers' labor intensity and increase the productivity; besides, the round angle ground out is smooth and uniform.